Astronomers are going to extraordinary lengths in the quest to tot up the ‘ordinary’ matter in the Universe. The latest initiative has probed hot gas in intergalactic space by means of an X-ray lighthouse.
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Shull, J. Hot pursuit of missing matter. Nature 433, 465–466 (2005). https://doi.org/10.1038/433465a
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DOI: https://doi.org/10.1038/433465a
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